CN104605810B - A kind of for the dioptric detecting system of progressive multi-focus lens - Google Patents
A kind of for the dioptric detecting system of progressive multi-focus lens Download PDFInfo
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- CN104605810B CN104605810B CN201510081320.9A CN201510081320A CN104605810B CN 104605810 B CN104605810 B CN 104605810B CN 201510081320 A CN201510081320 A CN 201510081320A CN 104605810 B CN104605810 B CN 104605810B
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- eyeglass
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Abstract
The invention discloses a kind of for the dioptric detecting system of progressive multi-focus lens, including: light source, slit and the video camera set gradually along optical axis, eyeglass to be detected is located between slit and video camera, and move along the operating path being perpendicular to described optical axis, the operating path of described eyeglass to be detected is provided with several working positions, for each working position, described video camera moves along described optical axis, and carries out captured in real-time acquisition video flowing；Also include data processing module, for for the video flowing under each working position, therefrom choose the two field picture that definition is the highest, and calculate the diopter of eyeglass to be detected according to the camera position that this moment is corresponding.The detecting system of the present invention, easy to use, utilize the principle that single-point detects, only by eyeglass to be detected is carried out displacement, i.e. obtain the diopter of whole eyeglass, simple to operate, be easily achieved.
Description
Technical field
The present invention relates to optometry technical field, be specifically related to a kind of dioptric for progressive multi-focus lens
Detecting system.
Background technology
Epidemiological study shows, myopia has become global medical science and social problem, especially in Asia
Myopia sickness rate rises year by year.In China, myopia prevalence remains high, and its students in middle and primary schools are 22.7%,
Junior school student surges to 55.2%, and high school student then increases to 70.3%, and undergraduate ratio is more up to 80%,
Myopia becomes the subject matter of puzzled China teenagers healthy growth.On the other hand, step into along with society
Aging, increases owing to family planning controls Chinese population, thus causes the speed meeting of Chinese society's aging
More accelerating, the quantity of current presbyopia patient is up to or more than 300,000,000, and the market potential of presbyopia eyeglass is can not
Estimate.Progressive lens a beyond doubt huge leap occurs, it be a kind of focal power from top to bottom by
The cumulative eyeglass added, along with eye-observation scope is by as far as the present, the focal power of this eyeglass is gradually increased.
Along with the corresponding gradual change focus lens detecting instrument of opening in market also will be much more popular, if simple from abroad
Buying, not only instrument and equipment is expensive, simultaneously because the operation employee of manufacturer, the testing of optician's shop
Light teachers etc. are affected by educational background, and it is handy to accomplish the operation of instrument.Based on above-mentioned situation, I
Consider to be engaged in the development of the test instrunment being specifically designed for progressive lens detection.The gradual change of our research is burnt
Detecting instrument will have following several big advantage:
(1) operation friendly interface uses gradual change Jiao's detector operation software of independent development；
(2) with strong points testing for domestic optician's shop joins gradual change mirror, factory's inspection gradual change mirror and designing；
(3) cheap because independent development and remove unnecessary function so can effectively reduce
Price, by simple computation, market sale price according to preliminary estimation is at about 50,000 yuan；
(4) will be easy to after the strong product promotion of market adaptability by domestic optician's shop and produce eyeglass factory
Family is accepted.
Along with constantly widening of progressive lens market, the product of this Project-developing also will be more and more flourishing, and it takes
The economic results in society obtained are bound to the hugest.
Simultaneously on technical meaning, the research also can reduce China in association area with the external skill existed
Art gap, establishes solid foundation for China in the future can obtain long term growth in the field.
Owing to the diopter of progressive multi-focus lens is different from whole surface range, and its face shape is one
Kind of the nonaxisymmetrical surface of revolution, the most only measures the point of minority or bus for evaluating progressive multi-focus lens
Whole shape is far from being enough, it is necessary to record point as much as possible, obtains ball luminosity and the astigmatism of each point
The parameters such as degree.The most more to the detection method of progressive multi-focus lens, the method for predominantly detecting has: single-point is surveyed
Mensuration, Moire deflectometry, Ronchi grating method and Hartmann method.
Single-spot way can measure the diopter distribution letter of one smaller area central point of eyeglass the most accurately
Breath, but, although single-spot way can accurately provide the information of the luminous point chosen, but it can only be disposable
Detect the diopter distribution at a small region center of eyeglass, but in view of progressive multi-focus lens is for eyeglass
The strict control of the number of degrees, only detection base point for evaluating the dioptric information of whole progressive multi-focus lens are
Far from being enough.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of for the dioptric inspection of progressive multi-focus lens
Examining system.
One is used for the dioptric detecting system of progressive multi-focus lens, including: the light set gradually along optical axis
Source, slit and video camera, eyeglass to be detected is located between slit and video camera, and along being perpendicular to described optical axis
Operating path move, the operating path of described eyeglass to be detected is provided with several working positions, for each
Working position, described video camera moves along described optical axis, and carries out captured in real-time acquisition video flowing；
Also include data processing module, for for the video flowing under each working position, therefrom choose definition
A highest two field picture, and the diopter of eyeglass to be detected is calculated according to the camera position that this moment is corresponding.
When utilizing the diopter that this detecting system detects eyeglass to be detected (i.e. progressive multi-focus lens), first
Eyeglass to be detected is fixed on a certain working position, and then the distance between mobile camera and eyeglass to be detected, makes
The image (slit photographed) that video camera photographs is clear, then according to the position calculation of now video camera
The diopter of eyeglass light area.Owing to eyeglass to be detected can move, therefore, according to default working ways
Eyeglass to be detected is moved to next working position by footpath, and (now the light area of eyeglass is moved the most accordingly
Dynamic), the diopter of the most available now light area.By rationally arranging working position,
I.e. can get the diopter in all regions on eyeglass.
As preferably, in the present invention, the distance between operated adjacent position is 1mm, to guarantee testing result
Reliability.
This detecting system, by making eyeglass to be detected move, utilizes single-spot way to detect, has principle
The most clear, easy to operate, can accurately and rapidly measure the advantage of each dot information of eyeglass, and can completely is measured
The diopter of whole eyeglass.
The central point of described light source, the central point of slit, the remote datum mark of eyeglass to be detected and video camera mirror
Tou Mian center is contour.
Described slit width is 0～2mm, and continuously adjustabe.Service condition according to distance can regulate narrow
Seam width, and then most preferably tested effect.
Described slit is 20～40cm to the distance (along the distance of optical axis) of eyeglass to be detected.As preferably,
Described slit is 30cm to the distance of eyeglass to be detected.
The detecting system of the present invention also includes mobile device, and described mobile device drives shooting by motor
Machine moves along described optical axis.Accordingly, described data processing module is according to the mobile step of described motor
Enter to obtain the position of video camera under the image capture moment that definition is the highest.
The image the highest for obtaining definition, in addition to driving video camera by motor and moving, as excellent
Choosing, the camera lens of described video camera can carry out manual focusing, should be mutually and obtain the image taking that definition is the highest
Time video camera position, as another kind of implementation, described mobile device is provided with reading scale, should
Reading scale includes reading carefully and thoroughly scale and skimming reading scale, and skimming reading scale is used for showing the position that motor drives,
The reading of skimming reading scale and precision scale, for showing the position of manual focusing, is added by skimming reading scale,
Obtain the physical location of now video camera.
Described data processing module is according to video camera during the shooting of definition the highest image and eyeglass to be detected
Between distance calculate the diopter of eyeglass glazed thread irradiation area to be detected under this working position.The present invention adopts
By the acutance of marginal point in image as the definition of this image, first arbitrarily select from described image during calculating
Take a marginal point, and obtain centered by this marginal point, size is the image block of 3 × 3, then according to such as
Acutance P of lower formula calculating marginal point:
Wherein, max (f) is in two pixels on diagonal position and midline position in being described image block
The maximum of gray scale difference, min (f) is two pictures being in described image block on diagonal position and midline position
The minima of the gray scale difference of vegetarian refreshments, n=8.
The present invention uses the computational methods of pixel field gradient one by one, i.e. chooses 8 near certain pixel
Individual, calculate minimum and maximum gray value, then carry out the difference of two squares and try to achieve image every some gray scale diffusion around
Statistics, its value is the biggest, shows that image is the most clear.
Obtain image and focal length from actual, it can be seen that the image effect quality of acquisition is preferable, finally counts
It is the least with the relative error of actual refraction degree that calculation obtains the diopter of eyeglass to be detected under this working position.In reality
During application, calculate the time of a two field picture definition probably at 2ms by this algorithm, it is judged that image is the biggest
Generally completing about 10 frames, the most whole auto-focusing time completes at about 20ms.
Described data processing module calculates the diopter D of eyeglass to be detected by the following method:
Distance between condenser lens and the eyeglass to be detected of video camera when x is shooting, F is the poly-of video camera
The focal length of focus lens, l is the distance that slit arrives eyeglass to be detected, and H is the height of slit, and H " is video camera
The height of the slit photographed.
Slit is made up of upper and lower two parts shelter, and in the present invention, the slit height of indication and slit width are two
Individual different concept, slit height refers in particular to the farthest of the lower edges of the shelter of two parts up and down of composition slit
Distance.
The detecting system of the present invention is easy to use, utilizes the principle that single-point detects, only by eyeglass to be detected
Carry out displacement, i.e. obtain the diopter of whole eyeglass, and utilize video camera to move along optical axis, by based on limit
The definition evaluation methodology of edge point acutance, substantially increases the accuracy of final detection result.
Accompanying drawing explanation
Fig. 1 is the structural representation for the dioptric detecting system of progressive multi-focus lens of the present embodiment；
Fig. 2 is the spectrogram of halogen tungsten lamp.
Detailed description of the invention
Describe the present invention below in conjunction with the drawings and specific embodiments.
The present embodiment for the dioptric detecting system of progressive multi-focus lens, include as shown in Figure 1 along light
Light source 1, slit 2 and the video camera 3 that axle sets gradually, eyeglass 4 to be detected be located at slit and video camera it
Between, and move along the operating path being perpendicular to optical axis, the operating path of eyeglass to be detected is provided with several works
Making position, for each working position, video camera moves along optical axis, and carries out captured in real-time acquisition video flowing；
Also include data processing module (not shown in figure, in the present embodiment, data processing module is host computer,
Use ordinary PC), for for the video flowing under each working position, therefrom choose definition the highest
One two field picture, and the diopter of eyeglass to be detected is calculated according to the camera position that this moment is corresponding.
Wherein, the central point of light source 1, the central point of slit 2, the remote datum mark of eyeglass to be detected 4 and
The center, face of video camera 3 camera lens is contour.Slit height is 10mm, and slit width is 0～2mm, and even
Continuous adjustable, the distance of slit to eyeglass to be detected is 30cm.
One suitable light source is possible not only to improve image quality, and can reduce successive image Processing Algorithm
Complexity.Consider the use characteristic of eyeglass to be detected, the light sensitive characteristic of ccd video camera and each light source
Characteristic, selection halogen tungsten lamp (running voltage 12V) is as the light source in this device, with the production of ocean company
USB4000 spectrogrph measures the spectrogram obtained as shown in Figure 2.As can be seen from the figure halogen tungsten lamp
The wave-length coverage of the light sent mainly at 400～700nm (visible rays), extremely meets eyeglass to be detected
Actual application.
The detecting system of the present embodiment includes that mobile device fixed by eyeglass, and this eyeglass is fixed mobile device and included mirror
Sheet stationary fixture, screw mandrel, motor and positioning circuit are constituted, and motor is in the effect of positioning circuit
The eyeglass to be detected that lower drive is fixed on eyeglass stationary fixture moves, and often moves the most corresponding one an of step-length
Working position.
The a length of 11.50cm of screw mandrel in the present embodiment, pitch is 1.0mm.Motor model is
57BYG007-01, design parameter is as follows: the number of phases, and 4；Voltage, 12V；Electric current, 0.38A；Resistance,
32Ω；Inductance, 30mH；Static torque, 0.35N.m；Fuselage is long, 41mm；Go out axial length, 21mm；
Weight, 0.45Kg；The motor number of teeth, 50.Using the working method of four phase eight beat, therefore step angle is 0.9
Degree.Positioning circuit uses GK122 optocoupler and positions.
The detecting system of the present embodiment also includes mobile device, and mobile device drives video camera by motor
Moving along optical axis, the step-length of motor is 0.01mm.Data processing module is according to the movement of motor
Step number and step-length can obtain the position of video camera.
Video camera in the present embodiment is ccd video camera, the mirror of the video camera of corresponding the present embodiment indication
Head is construed as the condenser lens of this ccd video camera.
This ccd video camera uses the High resolution apparatus collection dress as image of THDC company production
Put.This camera has the USB2.0 view output function of standard, it is achieved dock appearing picture with PC data,
Microscopic sample image can be recorded simultaneously, take pictures and data preservation；The picture of shooting clearly thorough, color
Coloured silk is true to nature, background noise is little, and resolution is up to 1600*1200；Can AWB, in different illumination
The color rendition keeping object under environment is more preferable；Under Win2000, XP and higher system, it is not necessary to peace
Fill special driver；Machine volume is small and exquisite attractive in appearance, saves assembly space.Mobile device can carry
Ccd video camera carries out horizontal shifting, by sharpness evaluation function find the most clearly as, determine
Focal length, from the diopter deriving eyeglass.
In the present embodiment data processing module according to video camera during the shooting of definition the highest image with to be checked
The distance surveyed between eyeglass calculates the diopter of eyeglass glazed thread irradiation area to be detected under this working position.
For ease of the accurate definition obtaining image, the present embodiment use the acutance of marginal point in image make
For the definition of this image, from described image, during calculating, first arbitrarily choose a marginal point, and obtain with
Centered by this marginal point, size be the image block of 3 × 3, then according to equation below calculate marginal point acutance
P:
Wherein, max (f) is in two pixels on diagonal position and midline position in being described image block
The maximum of gray scale difference, min (f) is two pictures being in described image block on diagonal position and midline position
The minima of the gray scale difference of vegetarian refreshments, n=8.
In the present embodiment, data processing module calculates the diopter D of eyeglass to be detected by the following method:
Distance between condenser lens and the eyeglass to be detected of video camera when x is shooting, F is the poly-of video camera
The focal length (F=16mm in the present embodiment) of focus lens, l is the distance that slit arrives eyeglass to be detected, and H is narrow
The height of seam, H " is the height of the slit that video camera photographs.
When eyeglass to be detected being detected based on this detecting system, comprise the steps:
The first step: open instrument box, is fixed on eyeglass by eyeglass to be detected and fixes on the fixture of mobile device,
Then instrument box is built.
Second step: regulation slit width, is typically chosen in 0.1mm.(can carry out according to practical situations
Fine setting.)
3rd step: open light source switch, by source alignment slit, and keeps light source height, uses straight here
Connect and hang on instrument entrance slit.
4th step: open ccd video camera and operation software system, eyeglass to be detected is moved to default
On working position, then mobile camera so that it is the definition experience of the image collected obscures to clearly, then
To fuzzy change procedure, then obtain, according to data processing module, the image that definition is the highest, and according to this
Time video camera camera lens be calculated bending of lens area corresponding to this working position to the distance of eyeglass to be detected
Luminosity.
Progressive human-like 1.6 good brilliant shield eyeglasses of Luo Dunsi get P system that Rodenstock GmbH company is produced
Carry out actual test.This eyeglass is monolayer composite membrane, and without color and luster eyeglass, its parameter index is: refractive index
N=1.597, Abbe number Vd=40.5.Test condition: light source is the halogen tungsten lamp that 12V voltage stabilizing is powered, narrow
Seam width is 0.1mm, distance l=300mm of thing (slit) to eyeglass to be detected, makes eyeglass to be detected
Remote datum mark (on eyeglass the most to be detected, diopter is the point of 1000 degree) and thing, condenser lens, CCD
Center, face is contour vertically.By regulation ccd video camera longitudinal separation so that it is obtain clear photograph (narrow
The photo of seam), actually measured distance x=85.80mm.Actual measured value (reason basically identical with calculated value
Opinion value 86.90mm), precision is 1.26%.
Technical scheme and beneficial effect have been carried out specifically by above-described detailed description of the invention
Bright, it should be understood that to the foregoing is only presently most preferred embodiment of the invention, it is not limited to the present invention,
All made in the spirit of the present invention any amendment, supplement and equivalent etc., should be included in this
Within the protection domain of invention.
Claims (7)
1. one kind is used for the dioptric detecting system of progressive multi-focus lens, it is characterised in that including:
Light source, slit and the video camera set gradually along optical axis, eyeglass to be detected be located at slit and video camera it
Between, and move along the operating path being perpendicular to described optical axis, the operating path of described eyeglass to be detected is provided with
Several working positions, for each working position, described video camera moves along described optical axis, and carries out in real time
Shooting obtains video flowing；
Also include data processing module, for for the video flowing under each working position, therefrom choose definition
A highest two field picture, and the dioptric of eyeglass to be detected is calculated according to camera position when shooting this two field picture
Degree；
Described data processing module is according to video camera during the shooting of definition the highest image and eyeglass to be detected
Between distance calculate the diopter of eyeglass glazed thread irradiation area to be detected under work at present position；
In described data processing module employing image, the acutance of marginal point is as the definition of this image, during calculating
First from described image, arbitrarily choose a marginal point, and obtain centered by this marginal point, size is
The image block of 3 × 3, then according to acutance P of equation below calculating marginal point:
Wherein, max (f) is in two pixels on diagonal position and midline position in being described image block
The maximum of gray scale difference, min (f) is two pictures being in described image block on diagonal position and midline position
The minima of the gray scale difference of vegetarian refreshments, n=8.
2. as claimed in claim 1 for the dioptric detecting system of progressive multi-focus lens, its feature
It is, the central point of described light source, the central point of slit, the remote datum mark of eyeglass to be detected and video camera
The center, face of camera lens is contour.
3. as claimed in claim 1 for the dioptric detecting system of progressive multi-focus lens, its feature
Being, described slit width is 0～2mm, and continuously adjustabe.
4. as claimed in claim 1 for the dioptric detecting system of progressive multi-focus lens, its feature
Being, the distance of described slit to eyeglass to be detected is 20～40cm.
5. as claimed in claim 1 for the dioptric detecting system of progressive multi-focus lens, its feature
Being, also include mobile device, described mobile device drives video camera to move along described optical axis by motor
Dynamic.
6. as claimed in claim 5 for the dioptric detecting system of progressive multi-focus lens, its feature
Being, described data processing module obtains, according to the mobile stepping of described motor, the image that definition is the highest
The distance between video camera and eyeglass to be detected is inscribed during shooting.
7. as claimed in claim 1 for the dioptric detecting system of progressive multi-focus lens, its feature
Being, described data processing module calculates the diopter D of eyeglass to be detected by the following method:
Distance between condenser lens and the eyeglass to be detected of video camera when x is shooting, F is the poly-of video camera
The focal length of focus lens, l is the distance that slit arrives eyeglass to be detected, and H is the height of slit, H " it is video camera
The height of the slit photographed.
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| TWI584778B (en) * | 2016-02-04 | 2017-06-01 | 慈濟學校財團法人慈濟大學 | Optical measurement device and system thereof |
| BR112018014038B1 (en) * | 2016-02-22 | 2023-02-14 | Essilor International | METHOD FOR DETERMINING A PARAMETER OF AN OPTICAL DEVICE COMPRISING AT LEAST ONE OPTICAL LENS |
| CN107870406A (en) * | 2017-11-06 | 2018-04-03 | 北京大恒图像视觉有限公司 | A kind of fast automatic focusing algorithm based on liquid lens |
| CN108042103B (en) * | 2017-11-30 | 2020-02-18 | 武汉琉明光电科技有限公司 | Method, device and related system for detecting astigmatism |
| CN109733329A (en) * | 2019-01-22 | 2019-05-10 | 南京信息职业技术学院 | A kind of automobile defogging method and demister based on machine vision |
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| JP4158906B2 (en) * | 2002-07-19 | 2008-10-01 | Ｈｏｙａ株式会社 | Optical performance display method of spectacle lens |
| CN101266194B (en) * | 2007-08-27 | 2011-09-07 | 温州医学院眼视光研究院 | High precision image quality detection system for optical eye lens |
| CN201122124Y (en) * | 2007-11-28 | 2008-09-24 | 李正忠 | Optical testing machine |
| JP5438036B2 (en) * | 2009-01-30 | 2014-03-12 | Ｈｏｙａ株式会社 | Spectacle lens evaluation method, spectacle lens design method, and spectacle lens manufacturing method |
| CN102338693A (en) * | 2010-07-20 | 2012-02-01 | 上海雄博精密仪器股份有限公司 | Method and device for detecting progressive multifocal lens |
| CN201751823U (en) * | 2010-07-20 | 2011-02-23 | 上海雄博精密仪器股份有限公司 | Detecting apparatus for progressive multi-focal point glasses |
| FR2968400B1 (en) * | 2010-12-03 | 2012-12-28 | Essilor Int | METHOD FOR DETERMINING AT LEAST ONE CHARACTERISTIC OF REFRACTION OF AN OPHTHALMIC LENS |
| CN102288392A (en) * | 2011-07-29 | 2011-12-21 | 温州医学院 | Two-dimensional Ronchi grating-based freeform surface spectacle lens focal power measuring device |
| CN102564739A (en) * | 2011-12-27 | 2012-07-11 | 中国科学院光电技术研究所 | Optical lensmeter |
| CN102661855A (en) * | 2012-05-31 | 2012-09-12 | 上海理工大学 | Method and system for progressive additional lens detection based on optical coherence tomography |
| CN103217273A (en) * | 2013-03-25 | 2013-07-24 | 上海理工大学 | Multifocal lens diopter detection system and detection method thereof |
| CN103471816A (en) * | 2013-09-24 | 2013-12-25 | 上海理工大学 | Multi-optical-axis progressive spectacle lens measurement method |
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